The Wavefront OBJ format is the most widely adopted 3D model storage format. The file format name, OBJ, is in reference to its purpose of storing 3D OBJects. The OBJ format was originally the native file format for the 1980s era Advanced Visualizer 3D modeling package. Advanced Visualizer 3D is now obsolete, but some of its code was incorporated into its successor, the Maya 3D editing suite. In addition to just the OBJ geometry format, it has a sister format called MAT, which is used for material definitions.